US11605827B2 - Apparatus for regulating pressure of exhaust gas of fuel cell system - Google Patents
Apparatus for regulating pressure of exhaust gas of fuel cell system Download PDFInfo
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- US11605827B2 US11605827B2 US16/376,772 US201916376772A US11605827B2 US 11605827 B2 US11605827 B2 US 11605827B2 US 201916376772 A US201916376772 A US 201916376772A US 11605827 B2 US11605827 B2 US 11605827B2
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- porous foam
- exhaust gas
- exhaust tube
- regulator
- exhaust
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04694—Processes for controlling fuel cells or fuel cell systems characterised by variables to be controlled
- H01M8/04746—Pressure; Flow
- H01M8/04761—Pressure; Flow of fuel cell exhausts
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
- H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
- H01M8/04104—Regulation of differential pressures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
- B60L50/70—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by fuel cells
- B60L50/72—Constructional details of fuel cells specially adapted for electric vehicles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/30—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling fuel cells
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
- F01N1/082—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling the gases passing through porous members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/16—Silencing apparatus characterised by method of silencing by using movable parts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/02—Energy absorbers; Noise absorbers
- F16L55/027—Throttle passages
- F16L55/02745—Throttle passages by passing through a mass of particles or a porous member
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04694—Processes for controlling fuel cells or fuel cell systems characterised by variables to be controlled
- H01M8/04746—Pressure; Flow
- H01M8/04783—Pressure differences, e.g. between anode and cathode
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04992—Processes for controlling fuel cells or fuel cell systems characterised by the implementation of mathematical or computational algorithms, e.g. feedback control loops, fuzzy logic, neural networks or artificial intelligence
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/06—Combination of fuel cells with means for production of reactants or for treatment of residues
- H01M8/0662—Treatment of gaseous reactants or gaseous residues, e.g. cleaning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2270/00—Problem solutions or means not otherwise provided for
- B60L2270/10—Emission reduction
- B60L2270/14—Emission reduction of noise
- B60L2270/142—Emission reduction of noise acoustic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
- F01N2240/32—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a fuel cell
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/04—Devices damping pulsations or vibrations in fluids
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2250/00—Fuel cells for particular applications; Specific features of fuel cell system
- H01M2250/20—Fuel cells in motive systems, e.g. vehicle, ship, plane
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/40—Application of hydrogen technology to transportation, e.g. using fuel cells
Definitions
- the present disclosure relates to an apparatus for regulating the pressure of exhaust gas of a fuel cell system.
- Fuel cell systems which produce electrical energy through an electro-chemical reaction of fuel supplied thereto, have been studied and developed.
- the fuel cell systems may be classified into a phosphoric acid fuel cell (PAFC), a molten carbonate fuel cell (MCFC), a solid oxide fuel cell (SOFC), a polymer electrolyte membrane fuel cell (PEMFC), an alkaline fuel cell (AFC), and a direct methanol fuel cell (DMFC) according to the types of electrolytes used.
- PAFC phosphoric acid fuel cell
- MCFC molten carbonate fuel cell
- SOFC solid oxide fuel cell
- PEMFC polymer electrolyte membrane fuel cell
- AFC alkaline fuel cell
- DMFC direct methanol fuel cell
- the PEMFC is applied to a hydrogen vehicle (a hydrogen fueled cell vehicle) that is being developed to replace an internal combustion engine.
- the hydrogen vehicle is driven by producing electricity through an electro-chemical reaction of hydrogen and oxygen and operating a motor with the electricity produced.
- the hydrogen vehicle has a structure that includes a hydrogen (H 2 ) tank for storing hydrogen (H 2 ), a fuel cell stack (FC stack) for producing electricity through oxidation/reduction reactions of hydrogen (H 2 ) and oxygen (O 2 ), various apparatuses for draining water produced, a battery for storing the electricity produced by the fuel cell stack, a controller for converting and controlling the electricity produced, a motor for generating a driving force, and the like.
- the fuel cell stack refers to a fuel cell body having tens or hundreds of cells stacked one above another in series.
- the fuel cell stack has a structure in which a plurality of cells are stacked between end plates, each cell including an electrolyte membrane that divides the interior of the cell into two parts, an anode on one side of the electrolyte membrane, and a cathode on the other side thereof.
- a separator is disposed between the cells to restrict flow paths of hydrogen and oxygen.
- the separator is made of a conductor to move electrons during oxidation/reduction reactions.
- the hydrogen When hydrogen is supplied to the anode, the hydrogen is divided into hydrogen ions and electrons by a catalyst. The electrons produce electricity while moving outside the fuel cell stack through the separator. The hydrogen ions pass through the electrolyte membrane and move to the cathode, after which the hydrogen ions are combined with oxygen supplied from ambient air and electrons to produce water, and the water produced is discharged to the outside.
- a fuel cell system includes an exhaust gas pressure regulating apparatus (or a working pressure regulating apparatus) for regulating the working pressure of a fuel cell stack.
- the exhaust gas pressure regulating apparatus may regulate the working pressure of the fuel cell stack by regulating the pressure of exhaust gas from an outlet end of the fuel cell stack.
- an exhaust gas pressure regulating apparatus installed at a rear end of a fuel cell stack to regulate the working pressure of a fuel cell system may generate a turbulent flow of exhaust gas to cause noise due to the structure for suppressing a flow of the exhaust gas.
- the structure of the exhaust gas pressure regulating apparatus may be complicated, and the weight and manufacturing cost thereof may be increased.
- One aspect of the present disclosure provides an exhaust gas pressure regulating apparatus for reducing flow noise of exhaust gas.
- Another aspect of the present disclosure provides an exhaust gas pressure regulating apparatus having a more compact and lighter structure than an exhaust gas pressure regulating apparatus in the related art.
- an apparatus for regulating pressure of exhaust gas of a fuel cell system includes porous foam mounted in an exhaust tube and having a plurality of pores therein and a regulator that compresses or expands the porous foam to regulate a differential pressure of the exhaust gas flowing through the exhaust tube.
- FIG. 1 is a schematic view illustrating an exhaust gas pressure regulating apparatus according to an aspect of the present disclosure, where the apparatus is mounted on an exhaust tube of a vehicle;
- FIG. 2 is a view illustrating the operating principle of the exhaust gas pressure regulating apparatus of FIG. 1 ;
- FIG. 3 is a view illustrating effects of the exhaust gas pressure regulating apparatus of FIG. 1 .
- FIG. 1 is a schematic view illustrating an exhaust gas pressure regulating apparatus according to an aspect of the present disclosure, where the apparatus is mounted on an exhaust tube of a vehicle.
- the exhaust gas pressure regulating apparatus 100 may be installed in an exhaust system of a fuel cell vehicle to regulate the pressure of exhaust gas released from a fuel cell stack.
- the amount of supply gas flowing into the fuel cell stack may also be regulated because a pressure differential between an inlet end and an outlet end of the fuel cell stack varies.
- the exhaust gas pressure regulating apparatus 100 may be mounted on the exhaust tube 1 of the vehicle, through which the exhaust gas released from the fuel cell stack flows, to regulate a differential pressure of the exhaust gas.
- the differential pressure of the exhaust gas may be defined as a difference between the pressures of the exhaust gas before and after the passage of the exhaust gas through the exhaust gas pressure regulating apparatus 100 .
- the exhaust gas pressure regulating apparatus 100 includes porous foam 110 and a regulator 120 .
- the porous foam 110 may be mounted in the exhaust tube 1 .
- the porous foam 110 has a structure containing a plurality of pores or air gaps.
- the porous foam 110 may have a structure such as mesh foam, a sponge, or the like.
- the porous foam 110 may be compressed or expanded, and the volume of the porous foam 110 may be varied according to the compression or expansion of the porous foam 110 .
- the porosity ⁇ of the porous foam 110 may be varied with the volume variation thereof.
- the porosity ⁇ may be given by Equation 1 below.
- ⁇ is the porosity
- V S is the total volume of a material portion of the porous foam 110
- V V is the total volume of the pores in the porous foam 110 .
- the regulator 120 may compress or expand the porous foam 110 .
- the exhaust gas pressure regulating apparatus 100 is configured such that, as the porous foam 110 is compressed or expanded by the regulator 120 , the porosity ⁇ of the porous foam 110 is varied to regulate the differential pressure of the exhaust gas that flows through the exhaust tube 1 .
- an exhaust gas pressure regulating apparatus installed at a rear end of a fuel cell stack to regulate the working pressure of a fuel cell system may generate a turbulent flow of exhaust gas to cause noise due to the structure for suppressing a flow of the exhaust gas.
- the structure of the exhaust gas pressure regulating apparatus may be complicated, and the weight and manufacturing cost thereof may be increased.
- the exhaust gas pressure regulating apparatus 100 is aimed at reducing flow noise of exhaust gas that may be generated in the process of regulating the pressure of the exhaust gas.
- the exhaust gas pressure regulating apparatus 100 has a basic feature wherein, as the porous foam 110 is compressed or expanded by the regulator 120 , the porosity ⁇ of the porous foam 110 is varied to regulate the differential pressure of the exhaust gas that flows through the exhaust tube 1 .
- one end of the porous foam 110 may be fixed to the exhaust tube 1 and an opposite end of the porous foam 110 may be coupled to the regulator 120 with respect to the flow direction of the exhaust gas in the exhaust tube 1 .
- the one end of the porous foam 110 fixed to the exhaust tube 1 may be located upstream and the opposite end of the porous foam 110 coupled to the regulator 120 may be located downstream with respect to the flow direction of the exhaust gas.
- the porous foam 110 may be compressed by the flow resistance of the exhaust gas. That is because the movable opposite end of the porous foam 110 is located upstream of the fixed one end thereof.
- the porosity ⁇ of the porous foam 110 may be lowered to increase the differential pressure of the exhaust gas. Accordingly, the flow resistance of the exhaust gas may be further increased, and the porous foam 110 may be further compressed. In this case, the differential pressure of the exhaust gas may be excessively increased.
- the one end of the porous foam 110 fixed to the exhaust tube 1 is located upstream and the opposite end of the porous foam 110 coupled to the regulator 120 is located downstream with respect to the flow direction of the exhaust gas. Accordingly, the porous foam 110 is forced by the flow resistance of the exhaust gas in the direction in which the porous foam 110 expands, and is expanded or compressed by the regulator 120 . As a result, the performance of the fuel cell stack may be inhibited from being degraded on account of the suppression of a gas flow into the fuel cell stack due to an excessive increase in the differential pressure of the exhaust gas that is caused by the flow resistance of the exhaust gas.
- the length L of the porous foam 110 in the flow direction of the exhaust gas may be increased or decreased.
- the regulator 120 may include an actuator 121 and a movable part 122 .
- the actuator 121 may include, but is not limited to, at least one of a gear apparatus, a motor, and an electronic drive apparatus, and any unit capable of linearly moving the movable part 122 may be used as the actuator 121 .
- the actuator 121 may include a cylinder that provides a driving force for linearly moving the movable part 122 .
- the actuator 121 may be mounted on the outer circumferential surface of the exhaust tube 1 to provide a driving force to the movable part 122 .
- the movable part 122 may be linearly moved by the driving force from the actuator 121 .
- the movable part 122 may be provided outside the exhaust tube 1 and may be coupled to the opposite end of the porous foam 110 .
- the movable part 122 may be moved in the lengthwise direction L of the porous foam 110 by the driving force from the actuator 121 .
- the actuator 121 may include a cylinder, and the movable part 122 may include a piston inserted into the cylinder.
- the exhaust gas pressure regulating apparatus 100 may further include a first support part 140 .
- the one end of the porous foam 110 may be fixed to the inner circumferential surface of the exhaust tube 1 by the first support part 140 .
- the first support part 140 may be mounted in the exhaust tube 1 to cause the porous foam 110 and the exhaust tube 1 to be coupled together by the first support part 140 .
- the first support part 140 may suppress the one end of the porous foam 110 from being deformed by a flow of the exhaust gas while fixing the one end of the porous foam 110 to the inner circumferential surface of the exhaust tube 1 .
- the first support part 140 may extend toward a central portion of the exhaust tube 1 from the inner circumferential surface of the exhaust tube 1 .
- the first support part 140 may have a donut shape and may be coupled to a portion of the one end of the porous foam 110 that is in contact with the inner circumferential surface of the exhaust tube 1 .
- the one end of the porous foam 110 may be deformed due to the flow resistance of the exhaust gas.
- the porous foam 110 may be suppressed from being deformed due to the flow resistance of the exhaust gas.
- the exhaust gas pressure regulating apparatus 100 may effectively regulate the pressure of the exhaust gas.
- the exhaust gas pressure regulating apparatus 100 may further include a second support part 150 .
- the second support part 150 may couple the opposite end of the porous foam 110 and the movable part 122 .
- the exhaust tube 1 has a slot extending in the direction in which the second support part 150 moves.
- the second support part 150 may have a shape extending toward the central portion of the exhaust tube 1 from the inner circumferential surface of the exhaust tube 1 and may be coupled to the opposite end of the porous foam 110 .
- the second support part 150 may have a donut shape and may be coupled to a portion of the opposite end of the porous foam 110 that is in contact with the inner circumferential surface of the exhaust tube 1 .
- the opposite end of the porous foam 110 may be deformed due to the flow resistance of the exhaust gas.
- the porous foam 110 may be suppressed from being deformed due to the flow resistance of the exhaust gas.
- the exhaust gas pressure regulating apparatus 100 may effectively regulate the pressure of the exhaust gas.
- the exhaust gas pressure regulating apparatus 100 may further include a housing 130 to prevent or inhibit leakage of the exhaust gas from the exhaust tube 1 .
- the housing 130 may have an inner space in which the regulator 120 is accommodated.
- the housing 130 may have a shape that surrounds the regulator 120 and a portion of the exhaust tube 1 on which the regulator 120 is mounted.
- the exhaust gas pressure regulating apparatus 100 may further include a linear guide 160 for guiding the linear movement of the movable part 122 .
- the linear guide 160 may be mounted on the inner or outer circumferential surface of the exhaust tube 1 .
- the linear guide 160 may be mounted on the inner circumferential surface of the exhaust tube 1 and may extend in the lengthwise direction in which the porous foam 110 is compressed or expanded.
- the linear guide 160 may lead the porous foam 110 to deform in the lengthwise direction, and therefore the regulation of the exhaust gas pressure may be effectively performed according to the contraction and expansion of the porous foam 110 .
- FIG. 2 is a view illustrating the operating principle of the exhaust gas pressure regulating apparatus of FIG. 1
- FIG. 3 is a view illustrating effects of the exhaust gas pressure regulating apparatus of FIG. 1 .
- the porous foam 110 may have a structure containing a plurality of pores.
- the total volume containing a portion formed of the material of the porous foam 110 and a portion formed of the pores may be defined as V S +V V .
- V S is the total volume that the material portion occupies in the total volume V S +V V of the porous foam 110
- V V is the total volume that the pore portion occupies in the total volume V S +V V of the porous foam 110 .
- the total volume V S +V V of the porous foam 110 varies.
- the total volume V S of the material portion is almost constant since the volume of the material is almost unchanged.
- the total volume V V of the pore portion varies since the volumes of the pores are easily varied by pressure. Accordingly, the porosity ⁇ that is defined as a fraction of the total volume V V of the pore portion over the total volume V S +V V increases as the porous foam 110 expands and decreases as the porous foam 110 contracts.
- the flow resistance to which the exhaust gas is subjected while passing through the porous foam 110 may be decreased.
- the decrease in the flow resistance may be understood to be caused by a sparse structure of the porous foam 110 according to the increase in the porosity ⁇ of the porous foam 110 . Accordingly, the differential pressure of the exhaust gas may be decreased, and therefore the pressure of the exhaust gas at the rear end of the fuel cell stack may be decreased.
- the porous foam 110 may have a denser structure, and the flow resistance to which the exhaust gas is subjected while passing through the porous foam 110 may be increased. Accordingly, the differential pressure of the exhaust gas may be increased, and therefore the pressure of the exhaust gas at the rear end of the fuel cell stack may be increased.
- a correlation between the porosity ⁇ of the porous foam 110 and the differential pressure of the exhaust gas may be represented as in the graph of FIG. 3 .
- the differential pressure of the exhaust gas may gradually decrease and then converge to a predetermined value.
- the differential pressure of the exhaust gas may increase, and the rate of increase in the differential pressure of the exhaust gas may become larger.
- a turbulent flow component of the exhaust gas may be decreased by the porous foam 110 , and therefore noise caused by the turbulent flow of the exhaust gas may be reduced. Accordingly, a silencer separately mounted in a vehicle to reduce flow noise of exhaust gas may be omitted.
- the exhaust gas pressure regulating apparatus since the exhaust gas pressure regulating apparatus according to the present disclosure has a relatively constant shape without a structure, such as a disk or a flap, which a normal valve has, the exhaust gas may more uniformly flow through the exhaust gas pressure regulating apparatus. Accordingly, the smooth flow of the exhaust gas may reduce the flow resistance between the exhaust gas and the exhaust system and may improve the pressure regulation performance of the exhaust gas pressure regulating apparatus.
- the exhaust gas pressure regulating apparatus may regulate the pressure of exhaust gas with the porous foam and the regulator for compressing and expanding the porous foam, thereby reducing a turbulent flow component of the exhaust gas passing through the apparatus and thus reducing flow noise of the exhaust gas.
- the exhaust gas pressure regulating apparatus may have a simpler configuration and be made lighter in weight than an exhaust gas pressure regulating apparatus in the related art.
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Abstract
Description
Claims (9)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020180159393A KR20200071545A (en) | 2018-12-11 | 2018-12-11 | Device for adjusting pressure of exhaust gas of fuel cell system |
KR10-2018-0159393 | 2018-12-11 |
Publications (2)
Publication Number | Publication Date |
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US20200185745A1 US20200185745A1 (en) | 2020-06-11 |
US11605827B2 true US11605827B2 (en) | 2023-03-14 |
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Application Number | Title | Priority Date | Filing Date |
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US16/376,772 Active 2041-03-05 US11605827B2 (en) | 2018-12-11 | 2019-04-05 | Apparatus for regulating pressure of exhaust gas of fuel cell system |
Country Status (5)
Country | Link |
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US (1) | US11605827B2 (en) |
EP (1) | EP3667789B1 (en) |
JP (1) | JP2020095935A (en) |
KR (1) | KR20200071545A (en) |
CN (1) | CN111313057A (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
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KR102547220B1 (en) * | 2022-11-01 | 2023-06-23 | 삼중테크 주식회사 | High-efficiency absorption heating and cooling system using low-temperature exhaust gas |
KR102526411B1 (en) * | 2022-11-01 | 2023-04-27 | 삼중테크 주식회사 | High-efficiency absorption heating and cooling system using generator exhaust gas pipe for low-temperature exhaust gas |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
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US340696A (en) | 1886-04-27 | Alexander caldwell | ||
US4150696A (en) | 1974-03-04 | 1979-04-24 | Max-Planck-Gesellschaft Zur Forderung Der Wissenschaften E.V. | Arrangement for suppressing vibrations caused by the flow of a flowable medium |
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2019
- 2019-04-03 EP EP19166952.2A patent/EP3667789B1/en active Active
- 2019-04-05 US US16/376,772 patent/US11605827B2/en active Active
- 2019-04-26 CN CN201910343425.5A patent/CN111313057A/en active Pending
- 2019-07-18 JP JP2019132980A patent/JP2020095935A/en active Pending
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Also Published As
Publication number | Publication date |
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CN111313057A (en) | 2020-06-19 |
US20200185745A1 (en) | 2020-06-11 |
JP2020095935A (en) | 2020-06-18 |
EP3667789A1 (en) | 2020-06-17 |
EP3667789B1 (en) | 2021-03-31 |
KR20200071545A (en) | 2020-06-19 |
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